An Efficient, Practical, and Enantioselective Method for Synthesis of Homoallenylamides Catalyzed by an Aminoalcohol-Derived, Boron-Based Catalyst
作者:Hao Wu、Fredrik Haeffner、Amir H. Hoveyda
DOI:10.1021/ja500374p
日期:2014.3.12
A practical catalytic method for enantioselective addition of an allene unit to aldimines is disclosed. Transformations are promoted by an in-situ-generated B-based catalyst that is derived from a simple, robust, and readily accessible (in multigram quantities) chiral aminoalcohol. A range of aryl-, heteroaryl-, and alkyl-substituted homoallenylamides can be obtained in 66–91% yield and 84:16 to >99:1
公开了一种用于将丙二烯单元对映选择性加成到醛亚胺的实用催化方法。转化由原位生成的基于 B 的催化剂促进,该催化剂源自简单、稳健且易于获取(以数克数量计)的手性氨基醇。通过在环境温度和 0.1–3.0 mol% 的存在下进行反应,可以以 66–91% 的产率和 84:16 到 >99:1 的对映体比例获得一系列芳基、杂芳基和烷基取代的高烯基酰胺手性催化剂和市售的烯基硼试剂。催化协议不需要严格的无水条件,可以在克规模上进行,并促进高度选择性地添加丙二烯基单元(相对于炔丙基)。